Apparatus for constructing concrete floors.



.-N. F. AMBURSEN APPARATUS FOR CONSTRUCTING CONCRETE FLOORS.

Patented Sept. 10', 1918.

3 SHEETS-SHEET 1.

APPLlCATlON FILED AUG-2B 1917.

Patnted Sept. 10,1918.

3 SHEETS-SHEET 2.

N. F. AMBURSEN.

\NPLICATION FILED AUG.28. I917- APPARKTQS FOR (iONSTRUCTlNG CONCRETE FLOORS.

v fiverzior:

N. F. AMBURSEN.

AriARATUS FOR CONSTRUCTLNG CONCRETE FLOORS.

APPLICATION FINDING-28.1917.

1 ,278,086. Pafentedsepfl 10,1918.

3 SHEETS-SHEET 3- ,Zlverzior NILS FREDERICK AMBURSEN,

' MASSACHUSETTS. Y

-. UNITED STATES PATNT FFICE. F NEWTO%, MAJSS/AGHUSETTS, AssI Givo To THE "um-1 03M CO PANY, 015 BOSTON, MAssAoHUsn'r'rs, A CORPORATION or 'nrrARA'rUs non oonsrRiIcrING coivcmim FLOORS.

To all whom it may concern:

, Be it known :that I, NILS FREDERICK AM- Bunsen, citizen of the United States, and I a resident of Newton, in the countyof Midf li dlesex andState of Massachusetts, have invented a new and useful Improvement in Apparatus for. Constructing Concrete Floors, of which the following is a specification. ,3 r la The.principal objects of the present invention which is an. improvement. on the apparatus for constructing concrete fioors described in my United States. Letters Pate '16 are to provide means whereby two or more If: concrete forms canbeused for the construc- 1; tion of molded concrete floors of greater I span than the comblned, length of said forms, and toprovide means whereby the forms can be removed for immediate use elsewhere before the concrete has thoroughly hardened without injury to the ,molded structure. y

H With'these and other objects in view my I invention comprises longitudinally-spaced concrete forms of any suitable. construction, such for example as the wopden forms now 8 0 plate of any'suitable material, spanning the space between said forms and overlapping @the' ends thereof, together 'with false-work having...removable, support-pieces arranged beneath the bridging-member and the ends .85 of said forms and so constructed that the pieces upon which the forms rest.and the the between "the support-members and having '{9 their. lower edges resting onv the webs thereof. a bridging member which may be 7 a sl'iee't-inetal channel arranged between the support-menlbers. and overlapping the. ends ,thereof, and a cover-plate bridging the Specification of Letters Patent] entNo. 1,216,644: dated February 20, 1917 f in general use, for molding concrete floors, and a 'bridglngrmeinber, which may. be a forms themselves, may be removed when the.

metallic arcli-plat'es slio'n'n n said Letters Patent, said arclnplates spanning the space Patented Sept. 10, 11918.

Application file @4August 28, 1917. Serial No. 188,639.

forms and overlapping the ends of the same,

together with false vork having removable support-pieces arranged beneath the bridging-member and the ends of said support members, so that said support-members and the forms whichrest upon the same maybe removed before the concrete has thoroughly hardened.

My invention further comprises the parts and combinations of parts set forth in the appended claims. I

My invention may best be understoodfby having reference to the illustrative embodiments thereof shown in the accompanying drawings wherein I Figure 1 is an elevation showing the falsework supporting two channel-irons and a bridging-member. Fig. 2 is a plan view showing theforms in position before the in 'my'Letters Patent above. referred to,

with the exception that each channel is shorter than the distance. which the floor is intended to span. The channels or. concrete form, support-members of whatever type employed are temporarily supported on the stringers 3, 4 arranged beneath the ends thereof and said stringers in turn are supported. by'a post 5 havinga' cap 6 Mother suitable supporting means,- adj'usting members such as the wedges 7,"8 being interposed between the stringers and the cap for. the purpose of regulating the positions of said stringers. preferably a thin :shcet'metal channel having flanges 9 is arranged between the channels or form supporting-members and overlaps the ends thereof so that thereby-the The bridging-member 9' three channels and two bridging'members,

Cooperating with each lu'idging-member is a stringer 1t) resting on adjusting means such as the wedges 11 which in turn are supported by the cap 6 whereby the channels and the forms supported thereby may be removed before the concrete has thoroughly hardened without disturbing the false-work as hereinatter more fully described.

Spanning the space between the members of each pair of channels 1, 1 or 2, 2 is a concrete form herein shown as a metallic arch-plate 12 and illustrated as of angular conformation although as will readily be understood it may be curved in the manner shown in said patent. The lower edges of each arch-plate rest on the webs of a pair of adjacent channels and are arranged against the juxtaposed flanges 13, 13 of the same. In order to complete the mold I employ cover-plates 15 arranged between two adja cent arch-plates such as 19, 12 and overlapping the ends thereof, the lower edges o'l said cover-plates resting on the webs of two pairs of channels, for example, the pair 1, 1 and the pair 2,2, the members of each of said pairs of channels being spaced laterally and the pairs themselves being longitudinally separated, and said lower edges of each cover-plate being arranged against the juxtaposed flanges of two adjacent bridgingmembers, such as the members 9, 9".

In order to clamp the arch-plates, coverplates and bridging-members in position, the webs of the channels may be apcrtured at suitable intervals to receive the bolts 16 which pass through the clamps 17 arranged transversely of the channels. lVhen the parts are arranged as above described with the lower ends of the a reh-pla tes'against the juxtaposed flanges 13, 14- oi? a channel, the flanges 9 of the. bridginganem'ber being against the adjacent lower ends of a pair of arclrplates and the lower ends of the cover plates resting against saidiflangcs' of said bridging-member, they are secured in position by tightening the nut 18'.

Unless the cover-plates fit tightly over the arch-plates the under surface of the floor will not be smooth and therefore I prefer to employ means clamping or otherwise securing the cover-plates to the arch-plates. In the present instance I have shown a clamp bar 19 of wood. iron or other suitable material arranged under ea h cover-plate with its ends underlying the ends of the two ad jacent arch-plates and a bolt 20 passing through the cover-plate and clamp bar so that by means of thenut 21 the cover-plate may be securely clamped down on the arch plates which it bridges. This construction is desirable because it would ndt be practicable to clamp a cover platet directly to the arclrplates by means of bolts passing through both members, for, as above set forth, various combinations of rchannels and bridgiug-members are employedfor spans of various lengths so that the ainonnt of overlapping of the arch and cover-plates differs in various cases and therefore holes bored through the arch and cover-plates for receiving clamping bolts would not always be in register. v

The concrete is poured in the mold formed as above set forth and allowed to harden, and after it has thoroughly set but before it has completely hardened, the stringers 3, 4 are knocked out and the channels and archplatcs removed for immediate use elsewhere, the molded floor being sustained by the stringer 10 which as above set forth is placed under the. bridging member. Heretofore, so far as I am advised, it is customary to remove all the false-work to release the tormsas soon as the concrete has set and before it has thoroughly hardened and then to replace said false-work which is left in position until the concrete has hardened or the building is completed. It will therefore be seen that by the apparatus above described I can save considerable time and labor.

It will be understood of course that the wedges 7 8 and ll'which'are used for lining up the channels and bridging-members per mit the ready release of the stringers without injury to the posts and caps, and that in 105 the case of a molded roof said wedges will give the channels and bridging-members the proper slant. r i

It will be readily understood that my invention is not limited to use with metallic 110 concrete forms and that the construction shown in Fig. 1 may be employed with the wooden forms now generallyin use without sacrificing the advantages above described.

In Fig. 7 I have shown the application of my invention to a case where wooden forms are employed. In this figure 22, 22 represent such forms and 23 is a bridging-member which may be a plate of iron or other mate rial, or aplank, arranged between the forms and overlapping the ends thereof. The ends of the forms rest on the stringers 24, 25.11;- spectively and the latter are supported by the cap 6, the wedges 26, 27 or other position adjusting members being interposed respec tively between the stringers and the cap. The stringer 28 which rests on the wedges 29 is placed beneath the bridging-member, so. that, in a manner Which will be clearly w understood in view of the description of Fig. 1, the molded structure may be supported by said stringer and the false-Work ,z i,fte r the other, stringers have been removed ll hereueh yh den aj y s r Preambn the width of each ar h- 0. release the'gforms before the concrete has at itsbase' should beless than the distance 7 between the inner; faces of the" T"fianges 13, l ofa pairi of adjacent' channels 10' so that a will have to be rung out into juxtaposed position between said channels'and will thereby be placed under a certain amount of tension until, the channels are removed which is accomplished by unscrewing the H bolt. 16 and knocking out the stringers 3 and "4 as aforesaid, whereupon the elasticity of the arch-plates will causethem to spring back from the molded concrete, or at least permit their ready removal from the same. The-nut 21 must, of course, be unscrewed to "release the clamping bar 19 before the arch plates can be taken'down.

"It will be understood that various modifications may be made in the'particular apparatus above described without departing from the principle of my invention.

Having thus described illustrative embodiments of my invention without however limiting the same thereto, what I claim and desire to secure by Letters Patent of the United States is for constructing"concrete floprs, comprising in combination two pairs of'channels spaced longitudinally, the members of each pair being spaced laterally, a

, 1. Apparatus 1 airof brid in -members arran ed between said pairs of channels and overlapping the ends of the respective members thereof, metallic arch-plates spanning the members of each pair of channels, and a cover-plate arrangecl between saidarch-plates and overlapping the ends thereof and also engaging 'thebridging members.

2. Apparatus for constructing concrete floors, coniprislng in combination two long1- 'tu'dinally-spaced support-members for concrete forms, a bridging member arranged between said support-members and overlapping the ends thereof, false-work arranged beneath, said bridging-member and the ends of said support-members, and removable support-piecesplaced on said false-work and cooperatin respectively with said bridging member dial. with the ends of said support-- members.

3. Apparatus for constructing concrete floors, comprising in combination two pairs of longitutlinally-spaced concrete-form support-members, the elements of each pair being spaced laterally, a pair of bridging-incur.

.bersfarrangedlbetween said pair's of supportmembers and overlapping the ends of the "respective elements thereof, concrete forms resting upon each pair of support-members, and a bridglngfor'm arranged between sa d fl tudinallyspaced channels, a bridgingmem concrete forms and overlapping the ends thereof and also engaging the bridging mcmbers.

s, comprisingin coi nbination two longi;

Apparatus for, constructing concrete be! arranged. between said channels and, r,

overlapping the ends thereof, false-work are ranged beneath said bridging-member and;

the 'ends of said channels, and removable;

support-pieces placed; on said false-work an I cooperating respectively with said bridging} member and with the ends of said channels.

'5. Apparatus for constructing concrete floors, compr1sing in combination two pairs of channels spaced longitudinally, the members of each pair being spaced laterally, a pair of bridgingmcmbers arranged between said. pairs of channels and overlapping the ends of the respective members thereof, metallic arch-plates spanning the members of each pair of channels. a cover-plate arranged between said arch-plates and overlapping the ends thereof and also engaging the bridging member, and means securing said cover-plate to said arch-plates.

6. Apparatus for constructing concrctc floors, comprising in combinationtwo pairs of longitudinally-spaced concrete-form support-members, the elements of each pair being spaced laterally, a pair of bridgingniembers arranged between said pairs of support-members and overlapping the ends of the respective elements thereof, concrete forms resting upon each pair of supportmembers, a bridging-form arranged between said concrete forms and overlapping the port-pieces placed on said false-work and co- I operating respectively with said bridging-- member and with the ends of said supportmembers, and adjusting means forv regulating the positions of said support-pieces re spectively.

8. Apparatus for constructing concrete floors, comprising in combination pairs of channels spaced longitudinally, the members of each pair being spaced laterally, metallic arch-plates each having its lower edges resting on the webs of a pair of adjacent channels and arranged against the juxtaposed flanges thereof, a pair of bridging-members arranged between, each pair of channels and overlapping the ends of the respective memhers thereof, said bridging-members being channel-shaped and each having its flanges arranged against the adjacent lower edges of a pair of arch-plates, cover-plates each arranged between two adjacent arch-plates and overlapping the ends thereof, the lower edges of said cover-plates resting on the Webs of two pairs of channels and against the juxtaposed, flanges of two adJacent bridging-members, and means for clamping the flanges of each bridging-member and the adjacent lower edges of each pair of archplates and cover-plates to the flanges of a channel.

9. Apparatus for constructing concrete floors, comprising in combination two longitudinally-spaced concrete forms, a coverplate arranged between said forms and overlapping the ends thereof, a clamping member arranged beneath said cover-plate and having its ends underlying the ends of said forms, and means temporarily securing said member to said cover-plate.

In testimony whereof, I have hereunto iuliszcribed my name this 27th day of August,

NILS FREDERICK AMBURSEN. 

